[R-sig-Geo] viewing locally hosted mbtiles vector tiles using leaflet.mapboxgl?

[nevil amos]

Hi Tim,

Thanks for you suggestions.  I have looked at the leafgl package, and yes
it does speed the rendering of  my polygons, however  it still has to
render them all, rather than using the tiling option, so is not as quick as
tiles would be ( if they worked!).

I have no problem locally serving  raster tiles to r leaflet(), this can be
achieved by running a simplserver, or the mbtilesserver, or inside a shiny
app by placing the tiles in the www directory.  The issue is getting any
vector tiles to dislay - the leaflet.mapboxgl packages is the only option I
have come across so far that suggests this may be a possibility.
I have been using tippecanoe from the linux terminal.

cheers

Nevil







On Wed, 11 Mar 2020 at 21:34, Tim Salabim <tim.appelhans using gmail.com> wrote:

> Hi Nevil,
> while not being able to help with mbtiles, maybe you want to try
> leafgl to view your polygons.
>
> https://github.com/r-spatial/leafgl
>
> It should have no problems with 40k polygons.
>
> Regarding RStudio's leaflet.mapboxgl, I don't think it is intended for
> local use (though I might be wrong). For using locally stored tiles, I
> think we would need something like
> https://gitlab.com/IvanSanchez/Leaflet.TileLayer.MBTiles.
>
> Out of interest, are you using tippercanoe from your command line or
> do you have some code invoking it from R?
>
> HTH,
> Tim
>
> On Wed, Mar 11, 2020 at 3:00 AM nevil amos <nevil.amos using gmail.com> wrote:
> >
> > I am working on a shiny/ leaflet map project which requires display of a
> > large polygon dataset  (40,000 polygons ~92MB sf object).
> > Needless to say it take quite a time to render the sf object and zoom in
> > and out.
> >
> > Simplifying the polygons is not an option.
> >
> > leaflet.mapboxgl  https://github.com/rstudio/leaflet.mapboxgl package
> > allows adding of Mapbox GL layers to a leaflet map.
> >
> > Since I am using my own local tiles  there should be no need for a maxbox
> > access token.
> >
> > If possible I would like to make use of leaflet.mapboxgl: addMapboxGL()
> to
> > display vector tiles ( as .mbtiles) of the polygons that have been pre-
> > rendered from the polygon dataset using tippecanoe
> > https://github.com/mapbox/tippecanoe and served using mbtileserver
> > https://github.com/consbio/mbtileserver all on the same local machine.
> > mbtileserver is running from the project directory, and the mbtiles are
> in
> > the path: <R project directory>/tilesets/mytiles.mbtiles
> > I can vie the preview in the bowser a
> > http://localhost:8000/services/myTiles/map
> >
> > however the polygons do not dispay in leaflet in r
> >
> > As this requires use of tippecanoe and mbtileserver I cannot post a
> repro,
> > however below is a pared down version fo the code I am using :
> >
> >
> > library(leaflet)
> > library(leaflet.mapboxgl)
> >
> > options(mapbox.accessToken=NA)
> >
> > base_map <- leaflet() %>%
> >  setView(lng = 145,lat = -37,zoom = 7)%>%
> >  addProviderTiles("Esri.WorldTopoMap", group = "ESRI Topo") %>%
> >   addMapox http://localhost:8000/services/myTiles ")
> >
> > have I simply got the wrong format/ incomplete URL fo the  addMapboxGL ?
> If
> > so what should it be?
> >
> > thanks
> >
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> >
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>

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